基于数字高程模型的水文模拟对比分析

Study of hydrological simulation on the basis of digital elevation model

本文以GIS为平台,分析比较了不同类型的地形及网格大小的数字高程模型(DEM)所提取的汇流路径长度、坡度等地形特征值。在新安江模型参数物理意义研究的基础上,将汇流参数与地形特征值建立相关关系。利用相关关系确定参数,进行水文模拟,通过分析比较不同网格大小的DEM对水文模拟的影响。

On the platform of GIS the topographic characteristics of river basin, including the distance and slope of flood routing and slope for different kinds of landscape and different grid sizes digital elevation model (DEM) were compared. The interrationships between these characteristics and some parameters of Xinanjiang Hydrological Model were established based on the physical meaning of these parameters, and the parameters were determined consequently. The effect of DEM grid size on parameters and hydrological modeling were analyzed. It is suggested that the appropriate grid size of DEM must be determined according to the required accuracy of flood forecasting.